Having arrived in the Pannonian Plain by the end of the 9th century and conquering the people living north of the Drava River, Hungarians intensified their fast looting raids across continental Europe.They started occasionally to perform devastating raids and military campaigns to the south as well, across the Drava river, to the territory of the Principality of Pannonian Croatia.Somewhere at the beginning of the 10th century, Hungarians went further south and attacked the Duchy of Croatia, then ruled by Muncimir (892–910) and his successor Tomislav (910–928), two Knezes (Princes or Dukes) from the House of Trpimirović.Tomislav undertook measures to prevent Hungarian incursions, mobilizing his army, deploying to the north and carrying out the military actions to fight the enemy.At the 925 Synod Gregory of Nin lost his diocese and was offered to choose another one, among the temporary vacant bishop seats of Skradin, Sisak or Delmit (possibly Delminium - present-day Tomislavgrad, maybe Omiš).
Extended borders of Croatia around 925. after the battle of Drava.